Both the Canon and the Brother will turn into plotters! The Canon has 6 wire steppers, which work with 4 wire bipolar drivers. The Brother has 5 wire steppers, which I will control using the original electronics. I'll hijack some IC:s which contain darlingtons that steer the stepper motors.
Here's an image from the Canon. This is the wheel holding the (removed) typewheel. It has a stepper motor directly on same axis:
Note the brass plate under the green disk. And a hole in the brass plate. And a photo diode thing recognising the hole in the brass plate. So if you ever need a stepper motor with some kind of position control, you can try to find that in an old typewriter.